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   Re: [xml-dev] Re: RDDL -- How would you design it?

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At 2002-01-22 10:22 -0500, Elliotte Rusty Harold wrote:
>At 2:29 PM -0500 1/21/02, Clark C . Evans wrote:
>>   This is a serialized entity.
>>   This is a collection of documents which are
>>   somehow related.  A concrete implementation
>>   of a class could be a namespace URI; but
>>   not all namespace URIs are classes.
>This does not coincide with any of the customary meanings of the word 
>"class" I'm familiar with. I suggest using a different word for this thing.

Quoting SGML ISO 8879-1986 Section 4.102:

   Document Type:  A class of documents having similar characteristics;
                   for example, journal, article, technical manual, or

Quoting SGML ISO 8879-1986 Section 4.105:

   Document Type Definition: Rules, determined by an application, that apply
                             SGML to the markup of documents of a particular
                             type. ...

This definition of DTD doesn't confer that Document Type is restricted to 
only SGML, just that the DTD is the SGML way of looking at a Document Type 
(i.e. a class of documents).

>>Questions for the model...
>>  a. Can a Document belong to more than one Class?
>I think answering this question requires a clearer definition of "class". 
>In fact, I think all the questions require a better understanding of the 
>thing you're calling a class.

Going back to the roots of document markup, I think the term is very 

................. Ken

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